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TPS61291: Booster operation

Part Number: TPS61291
In one of my projects, I am using buck boost converter from TI # TPS61291. 
My power supply voltage is below 2.7V & When I am going to enable boost mode by giving high to enable pin through GPIO (from controller). Its not going in boost mode.
But when we are giving externally high to EN pin of TPS61291 then its working fine. I have follow the schematic & layout as per datasheet.
Here is the schematic & layout snap shot.